CN114500966B - Projection system for improving contrast ratio by dynamic black - Google Patents
Projection system for improving contrast ratio by dynamic black Download PDFInfo
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- CN114500966B CN114500966B CN202210074994.6A CN202210074994A CN114500966B CN 114500966 B CN114500966 B CN 114500966B CN 202210074994 A CN202210074994 A CN 202210074994A CN 114500966 B CN114500966 B CN 114500966B
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- primary color
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 241001125929 Trisopterus luscus Species 0.000 claims description 11
- 241001270131 Agaricus moelleri Species 0.000 claims description 8
- 239000003086 colorant Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
The invention relates to the technical field of projection systems, in particular to a projection system for improving contrast by utilizing dynamic black, which aims to solve the problem of improving the intra-frame contrast and the sequential contrast of the projection system, so that the projection system for improving the contrast by utilizing the dynamic black is provided.
Description
Technical Field
The invention relates to the technical field of projection systems, in particular to a projection system for improving contrast ratio by using dynamic black.
Background
With the continuous development of projection technology, the brightness index of the projection system is continuously improved, and the higher brightness means that the black background brightness value of the dark field picture of the projection system is higher, so that the detail of the dark field picture is displayed worse, and poor experience is brought to people in watching, so how to improve the intra-frame contrast and the sequential contrast of the projection system becomes an important problem for the study of the technicians in the field. In the prior art, as the application number is 202110257509.4, the patent name is a dynamic black quick response laser projection control system, and the technical scheme is that the brightness of a light source and the amplification factor of a video signal are controlled by detecting the highest gray level in a front-end video input image so as to reduce the black brightness value of a dark field picture. However, the method is limited by the front-end video signal, when the highest brightness gray level of the front-end video signal reaches the maximum, the sequential contrast ratio is not improved, and the scheme can only improve the sequential contrast ratio without any improvement on the intra-frame contrast ratio.
Disclosure of Invention
The present invention is directed to solving the problem of how to improve the intra-frame contrast and sequential contrast of a projection system, and therefore provides a projection system that utilizes dynamic black to improve contrast.
The invention is realized by adopting the following technical scheme:
The method comprises the steps that a projection system for improving contrast by utilizing dynamic black comprises a video image, a dynamic black control system, a light source driver, a light source and a projection display, wherein a front-end video image is input to the dynamic black control system, the dynamic black control system captures each frame of image information of the front-end video image and classifies the frame image according to primary colors, then whether each frame of primary color image carries out dynamic black image gain is analyzed sequentially, when the gray scale corresponding to the brightest pixel of the primary color image is equal to the maximum gray scale supported by the projection system, the primary color image is judged to be free from image gain compensation, the primary color image is output according to a primary color, a light source brightness signal corresponding to the primary color image is output by 100%, when the gray scale corresponding to the brightest pixel of the primary color image is smaller than the maximum gray scale supported by the projection system, the primary color image is judged to be required to carry out image gain compensation, a gain amplification coefficient K of the primary color image and a light source brightness signal pout corresponding to the primary color image are calculated, when the gain amplification coefficient K of the primary color image and the light source brightness signal corresponding to the primary color image are calculated, the primary color image is respectively amplified by the primary color image corresponding to the light source brightness signal corresponding to the primary color image, all primary color image signals are synchronously amplified and are synchronously displayed, and all primary color image signals are synchronously displayed, and the primary color images are synchronously displayed, and the primary color image signals are driven, and are synchronously driven and are displayed; the calculation formula of the gain amplification factor K of the primary color image is as follows: k= Gsys/gmax+ Koffset, gmax is the number of gray scales corresponding to the brightest pixel in the remaining pixels after the N brightest pixels are removed from the primary color image, N is a projection system custom value for ignoring the brightest pixel of the primary color image, gsys is the maximum number of gray scales supported by the projection display system, koffset is a compensation coefficient of the projection system, and a calculation formula of a light source brightness signal Pout corresponding to the primary color image is as follows: pout=1/k×100%.
Further, the brightest pixel of the primary color image is the brightest pixel in the rest pixels after the N brightest pixels are ignored, so that the image quality is improved better.
The beneficial effects of the invention are as follows: the projection system for improving contrast by utilizing dynamic black provided by the invention realizes independent dynamic black image processing of each primary color picture of each frame picture of the projection system, and simultaneously, the corresponding light source driving is controlled by the light source brightness signal corresponding to the output primary color picture, so that the light source is driven to project to the projection display, and the independent dynamic black regulation and control of the light source brightness of each primary color of each frame picture is realized, thereby effectively reducing the black field in the picture, fully showing the details of the dark field of each primary color, improving the sequential contrast and the intra-frame contrast of each frame picture, further reducing the power consumption of the projection system, prolonging the service life of the light source, reducing the heating value of the projection system and effectively improving the reliability of the projection system.
Drawings
FIG. 1 is a schematic diagram of a system of the present invention;
fig. 2 is an input frame image;
fig. 3 is an output frame image;
FIG. 4 is a raw source luminance;
FIG. 5 is a graph of the brightness of the light source after processing;
FIG. 6 is a schematic diagram of light source control;
fig. 7 is a schematic diagram of a frame image processing flow.
Detailed Description
Taking a three-primary-color image as an example, as shown in fig. 2, a projection system for improving contrast by using dynamic black includes a front-end video image, a three-primary-color dynamic black control system, a light source drive, a light source and a projection display, the front-end video image (three-primary-color image) is input to the dynamic black control system, the dynamic black control system captures each frame of image picture information of the front-end video image and divides the frame image into three-primary-color images, the dynamic black control system ignores N brightest pixels of each primary-color image, it is known in fig. 2 that the brightest pixel of the red image (after omitting the N brightest pixels), the gray scale corresponding to the brightest pixel of the green image (after ignoring the N brightest pixels), the gray scale corresponding to the brightest pixel of the remaining pixels is centered, the number of gray scales corresponding to the brightest pixels of the blue image reaches the maximum number of gray scales supported by the projection system, so that the blue image is judged to be free of image gain compensation, the blue image is output according to the original primary colors, the blue brightness signal is output 100%, the red image and the green image are judged to be required to be subjected to image gain compensation, the gain amplification coefficients K of the red image and the green image and the red and green brightness signals pout corresponding to the red image and the green image are calculated respectively, then the red image and the green image are subjected to image signal gain amplification according to the calculated gain amplification coefficients K of the red image and the calculated gain amplification coefficients K of the green image and the calculated gain amplification coefficients K of the red brightness signal and the calculated gain amplification coefficients pout of the red brightness signal and the calculated gain amplification coefficients K of the green image respectively, the red brightness signal and the green brightness signal pout are synchronously output red brightness signal and green brightness signal respectively, the red brightness signal and the green brightness signal are combined, and the green brightness signal is output to a projection display after all three primary color images of each frame are judged and processed, simultaneously, corresponding light source brightness signals corresponding to three primary color images of each frame synchronously control corresponding light source driving, the light source drives the light source to the projection display, the light source brightness signals are in direct proportion to the light source brightness, at the moment, the brightness of red light sources and green light sources is reduced, and the brightness of a blue light source is kept unchanged, so that the brightness of a dark field in a picture is reduced, and the contrast in the frame is improved; the calculation formula of the gain amplification factor K of the primary color image is as follows: k= Gsys/gmax+ Koffset, gmax is the number of gray scales corresponding to the brightest pixel in the remaining pixels after the N brightest pixels are removed from the primary color image, N is a projection system custom value for ignoring the brightest pixel of the primary color image, gsys is the maximum number of gray scales supported by the projection display system, koffset is a compensation coefficient of the projection system, and a calculation formula of a light source brightness signal Pout corresponding to the primary color image is as follows: pout=1/k×100%.
Claims (2)
1. The projection system for improving contrast by utilizing dynamic black is characterized by comprising a video image, a dynamic black control system, a light source driver, a light source and a projection display, wherein a front-end video image is input to the dynamic black control system, the dynamic black control system captures each frame of image picture information of the front-end video image and classifies frame images according to primary colors, then sequentially analyzes whether each frame of primary color image carries out dynamic black image gain, when the gray scale corresponding to the brightest pixel of the primary color image is equal to the maximum gray scale supported by the projection system, the primary color image is judged to be free from image gain compensation, the primary color image is output according to primary colors, the light source brightness signal corresponding to the primary color image is output by 100 percent, when the gray scale corresponding to the brightest pixel of the primary color image is smaller than the maximum gray scale supported by the projection system, the primary color image is judged to be required to carry out image gain compensation, the gain amplification coefficient K of the image and the light source brightness signal pout corresponding to the primary color image are calculated, the obtained through calculation is carried out the gain amplification coefficient of the primary color image and the light source brightness signal corresponding to the primary color image is calculated, and the primary color image is respectively corresponding to the primary color image brightness signal corresponding to the primary color image is driven by the light source brightness signal, and all primary color images are synchronously driven, and all primary color images are synchronously displayed, and the primary color images are synchronously displayed, and the primary color image is displayed; the calculation formula of the gain amplification factor K of the primary color image is as follows: k= Gsys/gmax+ Koffset, gmax is the number of gray scales corresponding to the brightest pixel in the remaining pixels after the N brightest pixels are removed from the primary color image, N is a projection system custom value for ignoring the brightest pixel of the primary color image, gsys is the maximum number of gray scales supported by the projection display system, koffset is a compensation coefficient of the projection system, and a calculation formula of a light source brightness signal Pout corresponding to the primary color image is as follows: pout=1/k×100%.
2. The projection system of claim 1 wherein the brightest pixel of the primary image is the brightest pixel of the remaining pixels after the N brightest pixels have been ignored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074994.6A CN114500966B (en) | 2022-01-22 | 2022-01-22 | Projection system for improving contrast ratio by dynamic black |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074994.6A CN114500966B (en) | 2022-01-22 | 2022-01-22 | Projection system for improving contrast ratio by dynamic black |
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| Publication Number | Publication Date |
|---|---|
| CN114500966A CN114500966A (en) | 2022-05-13 |
| CN114500966B true CN114500966B (en) | 2024-05-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040019528A (en) * | 2002-08-28 | 2004-03-06 | 엘지전자 주식회사 | Apparatus and method for controling light screen of projection display system |
| CN106791743A (en) * | 2016-12-08 | 2017-05-31 | 海信集团有限公司 | The method and apparatus that projected image shows |
| CN112118434A (en) * | 2019-06-20 | 2020-12-22 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN113099197A (en) * | 2021-03-10 | 2021-07-09 | 山西汉威激光科技股份有限公司 | Dynamic black quick response laser projection control system |
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- 2022-01-22 CN CN202210074994.6A patent/CN114500966B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040019528A (en) * | 2002-08-28 | 2004-03-06 | 엘지전자 주식회사 | Apparatus and method for controling light screen of projection display system |
| CN106791743A (en) * | 2016-12-08 | 2017-05-31 | 海信集团有限公司 | The method and apparatus that projected image shows |
| CN112118434A (en) * | 2019-06-20 | 2020-12-22 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN113099197A (en) * | 2021-03-10 | 2021-07-09 | 山西汉威激光科技股份有限公司 | Dynamic black quick response laser projection control system |
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| CN114500966A (en) | 2022-05-13 |
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